CN-224217363-U - Digital self-healing type low-voltage power capacitor

Abstract

The utility model relates to the technical field of power capacitors, and discloses a digital self-healing type power capacitor which comprises a shell and a movable plate, wherein an assembly frame is arranged beside the shell, at least two stacking frames are arranged in the shell, an outer frame is arranged in each stacking frame, and a capacitor core is arranged in each outer frame. The shell is internally provided with a temperature sensor for monitoring the running temperature of the capacitor core, and the outer frame is internally provided with a metallized film for repairing the capacitor core. The self-healing repair effect can be realized in an auxiliary way through the metallized film, when the capacitor core is subjected to electric breakdown, metal particles directionally migrate and deposit in a damaged area under the action of an electric field, and the autonomous recovery of the insulation performance is realized. The movable plate and the clamping frame are in mechanical engagement structure formed by the protruding blocks, so that the shearing strength of assembly is improved. The two cooperate to ensure the electrical reliability of the capacitor unit and the long-term stability of the mechanical structure.

Inventors

• LIN HONGSHU
• YANG DAOPING
• CHEN YANSHENG

Assignees

• 汕头市众业达电器设备有限公司

Dates

Publication Date

20260508

Application Date

20250526

Claims (8)

1. 1. The digital self-healing type low-voltage power capacitor comprises a shell (1) and a movable plate (42) and is characterized in that an assembling frame (2) is arranged at the side of the shell (1), at least two stacking frames (31) are arranged in the shell (1), an outer frame (32) is arranged in each stacking frame (31), a capacitor core (321) is arranged in each outer frame (32), a temperature sensor (52) for monitoring the operation temperature of the capacitor core (321) is arranged in the shell (1), and a metallized film (322) for repairing the capacitor core (321) is arranged in each outer frame (32).
2. 2. The digital self-healing low-voltage power capacitor of claim 1, wherein two assembly frames (2) are arranged, connecting holes (21) are formed in the two assembly frames (2), and the two assembly frames (2) are symmetrically distributed on two sides of the housing (1) by taking the central line of the housing (1) as a symmetrical axis.
3. 3. The digital self-healing type low-voltage capacitor of claim 1, wherein a threading hole (323) is formed in one end of the outer frame (32), an overpressure relief valve (324) is arranged at the other end of the outer frame (32), and a pressure relief channel (324 a) of the overpressure relief valve (324) is communicated with the inner side of the outer frame (32).
4. 4. The digital self-healing low-voltage capacitor according to claim 1, wherein the metallized film (322) is arranged in a wire harness array of the capacitor core (321) in any one or more of wire harness gap filling, wire harness surface coating and wire harness end sealing.
5. 5. The digital self-healing type low-voltage power capacitor according to claim 1, wherein two groups of clamping frames (41) are fixed on the inner wall of the shell (1), and a plugboard (421) which is inserted and installed with the clamping frames (41) is fixed at the bottom end of the movable plate (42).
6. 6. The digital self-healing type low voltage capacitor according to claim 5, wherein the contact surfaces of the clamping frame (41) and the plugboard (421) are provided with raised blocks (422) for improving friction force.
7. 7. The digital self-healing type low-voltage capacitor according to claim 1, wherein a connecting panel (51) is arranged in the movable plate (42), at least three wiring terminals (53) are arranged outside the connecting panel (51), the wiring terminals (53) are connected through wires, and a discharging resistor (54) is arranged on the connected wires.
8. 8. The digital self-healing type low voltage capacitor according to claim 7, wherein the connecting panel (51) is provided with a mounting groove, and the temperature sensor (52) is positioned in the mounting groove.

Description

Digital self-healing type low-voltage power capacitor Technical Field The utility model relates to the technical field of power capacitors, in particular to a digital self-healing type power capacitor. Background The digital self-healing type low-voltage capacitor is used as an important power compensation device and plays a key role in reactive power compensation and stable operation of a power system. For example, the low-voltage self-healing reactive compensation power capacitor disclosed in the Chinese patent publication No. CN206098160U is provided with a temperature sensor and a humidity sensor, so that the working temperature and humidity of the capacitor can be timely detected, the capacitor is displayed on an LED display screen, equipment is prevented from being damaged, an indicator lamp is connected, and the working state of the capacitor can be observed. The existing device is fixed in an electric cabinet through a mounting bracket and is connected with an external circuit through a terminal. However, in practical application, although the device is provided with a safety protection device such as a temperature sensor, a humidity sensor, an overpressure relief valve and the like, the self-healing capability of the device is limited when the inside of the capacitor fails. Particularly, when the capacitor is damaged by electric breakdown or the like, if the self-healing reaction is not timely or has poor effect, the insulation performance inside the capacitor can be reduced, and even larger faults are caused. Disclosure of utility model The utility model aims to provide a digital self-healing type low-voltage capacitor, which can realize self-healing repair effect in an auxiliary way through a metallized film, and when a capacitor core suffers electric breakdown, metal particles directionally migrate and deposit in a damaged area under the action of an electric field to realize the autonomous recovery of insulation performance. In order to achieve the purpose, the utility model provides the technical scheme that the digital self-healing type power capacitor comprises a shell and a movable plate, wherein an assembly frame is arranged at the side of the shell, at least two stacking frames are arranged in the shell, an outer frame is arranged in each stacking frame, and a capacitor core is arranged in each outer frame. A temperature sensor for monitoring the operating temperature of the capacitor core is arranged in the shell. The outer frame is internally provided with a metallized film for repairing the capacitor core. Preferably, two assembly frames are arranged, and the two assembly frames are provided with connecting holes. The two assembly frames are symmetrically distributed on two sides of the shell by taking the central line of the shell as a symmetrical axis. Preferably, a threading hole is formed in one end of the outer frame, and an overpressure relief valve is arranged at the other end of the outer frame. And the pressure relief channel of the overpressure relief valve is communicated with the inside of the outer frame. Preferably, the metallized film is arranged in the wire harness array of the capacitor core in any one or more of wire harness gap filling, wire harness surface coating and wire harness end sealing. Preferably, the inner wall of the shell is fixed with two groups of clamping frames, and the bottom end of the movable plate is fixed with a plugboard which is spliced and installed with the clamping frames. Preferably, the contact surfaces of the clamping frame and the plugboard are provided with protruding blocks for improving friction force. Preferably, a connection panel is arranged in the movable plate, at least three wiring terminals are arranged outside the connection panel, the wiring terminals are connected through wires, and a discharge resistor is arranged on the connected wires. Preferably, the connection panel is provided with a mounting groove, and the temperature sensor is positioned in the mounting groove. Compared with the prior art, the utility model provides a digital self-healing type low-voltage capacitor, which has the following beneficial effects: 1. According to the digital self-healing type low-voltage power capacitor, the self-healing repair effect can be achieved in an auxiliary mode through the metallized film, when the capacitor core suffers from electric breakdown, metal particles directionally migrate and deposit in a damaged area under the action of an electric field, and the self-recovery of the insulation performance is achieved. The self-healing mechanism can shorten the fault repair time and reduce the risk of unplanned shutdown. Meanwhile, the movable plate and the clamping frame are in a mechanical engagement structure formed by the protruding blocks, so that the shearing strength of assembly is improved, and structural deformation caused by transportation vibration and thermal expansion and contraction is effectively resisted. The two coo